import os
import datetime



def main():
        loginMenu()


def loginMenu():
#Loads The Main Menu
        print("""
#################################################################
#                                                               #
#                       Guild of the Ceramic Arts               #
#               Please Enter Your Login Details Below!          #
#                                                               #
#################################################################
""")

        #UserLogInAndCreatingUser
        authenticateUser()

#Authenticates and checks the users
def authenticateUser():
        authenticateUsername = ""
        authenticatePassword = ""
        while True:
                #Allows a User to Sign In
                username = str(input("\nPlease enter your username for your current Account! \n"))
                password = str(input("\nPlease enter your password for your current Account! \n"))
                #Checks User File For Any Users
                while True:
                        readUsers = open("Users.txt","r")
                        lines = readUsers.readlines()
                        if len(lines) == 0:
                                print("There is no Users file for you to search! Would you like to create a new file? \n") #Searches for a file
                        createUser()
                        continue
                authenticateCounter = 0
                #Checks For The Username and Password in The Specific Locations
                i = 0
                while i < len(lines):
                        location = lines[i]
                        authenticateUsername = location [0:10]
                        authenticateUsername = authenticateUsername.strip()
                        authenticateUsername = authenticateUsername.lower()
                        username = username.lower()
                        authenticatePassword = location[10:20]
                        authenticatePassword = authenticatePassword.strip()
                        authenticatePassword = authenticatePassword.lower()
                        password = password.lower()

                        if location == "":
                                readUsers.close()
                                break
                                if authenticateUsername == username and authenticatePassword == password:
                                        authenticateCounter = authenticateCounter + 1
                                        mainMenu()
                                        break
                                        i += 1
                                        if authenticateCounter ==0:
                                                print("\nThere is no user in the file with those login details, please re-try!. \n")
                                                loginMenu()
                        else:
                                break
                                main()


#Prints the Main Menu to the screen and Lists all options

def mainMenu():
        print("""

#################################################################################
#                                                                               #
#                                                                               #
#                               Welcome to the                                  #
#                                                                               #
#                       Guild of the Ceramic Arts                               #
#                                                                               #
#                               Main Menu                                       #
#                                                                               #
#                                                                               #
#                  Please choose what you would like to do?                     #
#                                                                               #
#                                                                               #
#  1 - Add a new User                                                           #
#                                                                               #
#  2 - Create a new customer                                                    #
#                                                                               #
#  3 - Add new product                                                          #
#                                                                               #
#  4 - Delete product                                                           #
#                                                                               #
#  5 - Create new order                                                         #
#                                                                               #
#  6 - Logout of your account                                                   #
#                                                                               #
#  7 - Print an Invoice                                                         #
#                                                                               #
#  8 - Delete a Customer                                                        #
#                                                                               #
#  9 - Unpaid orders                                                            #
#                                                                               #
#  10 - Leave the menu                                                          #
#                                                                               #
#################################################################################

""")
        mainMenu=input("What would like to do? Please pick an Option between the following... '1', '2', '3', '4', '5' , '6', '7' or '8', '9', '10' : ")
        #GoesToAddUserMenu
        if mainMenu =="1":
                createUser()
                return
        elif mainMenu =="2":
                createUser()
                return
        #GoesToCreateCustomerMenu
        elif mainMenu =="3":
                newProduct()
                return
        #GoesToAddNewProductMenu
        elif mainMenu =="4":
                removeProduct()
                return
        #GoesToRemoveProductMenu
        elif mainMenu =="5":
                createOrder()
                return
        #GoesToCreateAnOrderMenu
        elif mainMenu =="6":
                quit()
                return
        #MakesYourUserQuitAndLogOut
        elif mainMenu =="7":
                createInvoice()
                return
        #GoesToYourInvoiceMenu
        elif mainMenu =="8":
                deleteUser()
                return
        #GoesToDeleteUserMenu
        elif mainMenu =="9":
                unpaidOrders()
                return
        elif mainmenu =="10":
                paidOrders()
        #GoesToAllUnpaidOrders
        elif mainMenu =="11":
                quit()
        #QuitsTheProgram
        else:

                print("\nThat is not a valid number, you must select '1', '2', '3', '4', '5' , '6' or '7', '8', '9', '10': please try again. ")



#Takes You To Create a User
def createUser():
        userName, password1, password2 = "", "", ""
        #Creating a New Account For The User
        while True:
                userName=input("\n Please insert a new Username for the new user (input '0' to cancel and exit the create user menu): ")
                if userName =="-1":
                        mainMenu()
                #Creating a Username for the new user
                if len(userName)>10:
                        print("\n This username has to be between 1 and 10 characters!")
                #Allowing User To Create a Password
                elif userName.isalpha()==False:
                        print("\nYou need to use letters only!")
                #Allowing Letters Only To Be Used in The Username
                else:
                        break
                while True:
                        password1=input("\nInput a password for the user (input '-1' to cancel and exit): ")
                if password1 =="-1":
                        mainMenu()
                #Allowing a password to be made
                if len(password1)>10:
                        print("\nPassword has to be between 1 and 10 charcters!")
                password2=input("\nInput the password again (input '-1' to cancel and exit): ")
                if password2 =="-1":
                        mainMenu()
                if len(password2)>10:
                        print("\nPassword has to be between 1 and 10 charcters!")
                if password1 != password2:
                #Making the password requires less than 10 characters
                        print("\nThe passwords did not match, please try again!")
                else:
                        break

                userName=userName.lower()
                password1=password1.lower()
                #Location of the username and password to be stored at
                userNameStore=userName.ljust(10)
                password1Store=password1.ljust(10)
                #Where all user info is stored
                store=open("users.txt","a")
                iStore=userNameStore+password1Store+"\n"
                store.write(iStore)

                store.close()





def userName():
#ChecksFilesForCustomers
 def check_files():
        for i in ["stock","users","orders","customers"]:
                if not os.path.isfile(i+".txt"):
                        print ("Creating the " + i + " file....")
                        stockID = open(i+".txt", 'w')
                        print(i + " file created")
        #Creates files if no file is present
        print("\n" + userName + " has been successfully created!")
        print("Username  :",userName)
        print("Password  : ********** ")
        check_files()
#Allows The User To Delete an Account
def deleteUser():

        while True:
                username = input("\nPlease enter the username of the user you would wish to delete from the software: ")
                if username == "-1":
                #Finds the user to delete off the software
                        mainMenu()
                if len(username) >10:
                        print("\nYour username you have created must be less than 11 characters.\n")
                elif username.isalpha() == False:
                #The username is not in the boundaries of the characters used
                        print("\nThe username must only contain alpha.\n")
                else:
                        break
                store = open("users.txt","r")
                lines = store.readlines()
                store.close()
                store = open("users.txt","w")
                for line in lines:
                        if line[0:10].lower().strip() != username.lower().strip():
                                store.write(line)
                                store.close()
                                print("User is now successfully deleted")
                                #User is removed from the system

#Allows The User to Create an Account



def createUser():
        userName, password1, password2 = "", "", ""
        while True:
                userName=input("\n Please insert a new Username for the new user (input '-1' to cancel and exit the create user menu): ")
                if userName =="-1":
                        mainMenu()
                if len(userName)>10:
                        print("\n This username has to be between 1 and 10 characters!")
                elif userName.isalpha()==False:
                        print("\nYou need to use letters only!")
                else:
                        break
                while True:
                        password1=input("\nInput a password for the user (input '-1' to cancel and exit): ")
                if password1 =="-1":
                        mainMenu()
                if len(password1)>10:
                        print("\nPassword has to be between 1 and 10 charcters!")
                password2=input("\nInput the password again (input '-1' to cancel and exit): ")
                if password2 =="-1":
                        mainMenu()
                if len(password2)>10:
                        print("\nPassword has to be between 1 and 10 charcters!")
                if password1 != password2:
                        print("\nThe passwords did not match, please try again!")
                else:
                        break
                userName=userName.lower()
                password1=password1.lower()

                userNameStore=userName.ljust(10)
                password1Store=password1.ljust(10)

                store=open("users.txt","a")
                iStore=userNameStore+password1Store+"\n"
                store.write(iStore)

                store.close()


#Create an Order For The Users Product(s)



def createOrder():


        while True:
                customerID = input("Please enter your customer ID: ")
                with open('customers.txt') as f:
                        if customerID in f.read():
                                print("\nThe customer ID is valid")
                                break
                        #Customer ID of an order is invalid
                        else:
                                print("\nThat Customer ID does not exist. Please try again")
                                while True:
                                        orderID = input("Please enter a unique ID for your order to show your item (5 numbers): ")
                                        if orderID.isdigit()==False:
                                                print("\nYou can only use numbers for your unique ID in order to see your order")
                                        elif len(orderID) != 5:

                                                print("\nYou must use exactly 5 digits")
                                        #Digits of the order is not recognized and is over the limit of 5
                                        else:
                                                print("Your unique ID is OR" + orderID)
                                        break
                                        #Prints your unique order on to your screen

        while True:
                item_name = input("\nPlease type the name of the item you would like to purchase: ")
                with open('stock.txt') as f:
                        if item_name in f.read():
                                print("\nItem Successfully added")
                                #Items are added to basket ready to purchase for the customer
                                break
                        elif item_name not in f.read():
                                print("\nThis item currently does not exist. Please try again")
                                #Invalid item ID have been searched for
                                while True:
                                        readStock = open('stock.txt','r')
                                        location = readStock.readline()
                                        price = location[33:50]
                                        price = float(price)
                                        quantity = int(input("\nHow much of the product would you like to purchase? (Above 1 and Up to 100):  "))
                                        if quantity >100:
                                                print("\nYou can only buy up to 100 items")
                                        #You have exceeded the maximum number of orders placed in your basket
                                        elif quantity <1:
                                                ("\nYou must buy a minimum of 1 item!")
                                        #No items are placed and quantity of less than zero is invalid
                                        finalPrice = (price*quantity)
                                        if finalPrice >= 50:
                                                finalPrice *= 0.95
                                                readStock.close()
                                                break
        #Location of all orders and order ID plus all customer ID
        orderID = ("OR")+ orderID
        orderID=orderID.strip()
        orderID=orderID.lower()
        orderIDStore=orderID.ljust(60)
        customerID=customerID.strip()
        customerID=customerID.lower()
        customerIDStore=customerID.ljust(13)
        finalPrice=str(finalPrice)
        finalPrice=finalPrice.ljust(7)
        today = date.today()

        today = str(today)
        today = today.ljust(15)
        quantity = str(quantity)
        quantityStore = quantity.ljust(55)
        #Final price of the basket is displayed in the folder/file

        order_file = open('orders.txt', 'a')
        stock_file = open('stock.txt', 'r')
        for line in stock_file:
                if item_name in line:
                        line = line.ljust(12)
                        order_store = finalPrice + today + customerIDStore + line + quantityStore + orderIDStore +  "\n"
                        order_file.write(order_store)
                        print("\nThank you! Your chosen items have been successfully added to your order! ")
                        #Order has been placed and items are added to that also
                        order_file.close()
                        stock_file.close()
                        mainMenu()

def unpaidOrders(): #Opens unpaid orders function

    today = datetime.datetime.now() #Current Date is being retrieved

    with open('orders.txt') as orders:
        expired = []
        dates = [[datetime.datetime.strptime(i[130:196].strip(), '%Y-%m-%d %H:%M:%S.%f'),i[95:102]] for i in orders.readlines()]
        for i in dates: #Checking invoices and dates
            if datetime.datetime.now() > i[0] + datetime.timedelta(28):
                expired.append(i)
        if len (expired) >0:
            print("Unpaid orders:\n" + "\n".join([("Order ID: " + i[1] + " Date: " + i[0]) for i in[[str(i[0]),i[1]] for i in expired]])) #Prints The date of the late orders
        else:
            print("\nThere are currently no late orders")

    mainMenu()



#Create an Invoice for The Customers Order



def createInvoice():

    while True:
            orderID = input("Please enter your order ID\n ")
            with open('orders.txt') as f:
                    if orderID in f.read():
                            print("Invoice Printed")
                            break
                    #Invoice is now echoed to the screen and can be printed
                    else:
                            #Locating OrderID
                            print("Order ID was not found. Please try again")
                            with open ("orders.txt","r") as f:
                                    f.seek(0)
                                    for line in f.read():
                                            if orderID in line:
                                                    finalPrice = line[0:8]
                                                    today = line[8:18]
                                                    customerIDStore = line[23:32]
                                                    productQuantity = line[36:40]
                                                    date = line[48:60]
                                                    orderID = line[91:98]
                                                    productName = line[151:160]
                                                    productID = line[176:183]
                                                    productPrice = line[184:190]
                                                    finalPrice = finalPrice + 5.99
                                                    print("Final Price (Including £5.99:                        "+finalPrice)
                                                    print("Date:                                "+today)
                                                    print("Customer ID:                 "+customerIDStore)
                                                    print("Product Quantity:                    "+productQuantity)
                                                    print("Order ID:                            "+orderID)
                                                    print("Product Name:                        "+productName)
                                                    print("Product ID:                  "+productID)
                                                    print("Individual Product Price:                                    "+productPrice)

                                    break
                                                        #Location of the required ID and information of the Invoice


#Allows an Admin to Create a Product or to add a product(s)


def newProduct():
        productID = ""
        productName = ""
        productPrice = ""
        #Creating a product and adding the username
        while True:
                productName = input("\nInput the product name you would like to create: ")
                productName.strip()
                productName.lower()
                if len(productName)>25:
                        print("\nProduct name must be between 1 and 25 characters! Try Again! ")#Product Name is too long and not in boundaries
                        break
                while True:
                        productID = input("\nInput the product ID of the product you want to add (5 Numbers): ") #Product ID for a unique product
                        productID.strip()
                        if len(productID)>5:
                                print("\nThe product number, '"+str(productID)+"' that exceeds that amount required!")
                        if len (productID)<5:
                                print("\nThe prodcut number, '"+str(productID)+"' that is below the amount required!")
                        elif productID.isdigit()!= True:
                                print("\nYou can only use numbers for the product ID!") #Lists the required things to create the product
                        elif productID.isdigit()!= False:
                                print("\nYour product has been successfully added to the files!")
                                productID=input("\nTo exit please type: '-1': ")
                                if productID ==" -1":
                                        exit()
                                        break
        while True:
                productPrice=float(input("\nInput the price of the product: ")) #Adds a price to the given product
                productPrice=str(productPrice)
                productID = "PT"+productID
                productID.strip()
                productID.lower()
                productIDStore = productID.ljust(8)
                productName.strip()
                productName.lower()
                productNameStore = productName.ljust(25)
                store= open("stock.txt","a")
                istore= productNameStore + productIDStore + productPrice+ "\n"
                store.write(istore)
                store.close()
                print("\nFinished adding the new product")
                print("Product ID:              ",productIDStore)
                print("Product Name:    ",productNameStore)
                print("Product Price:           ",productPrice)
                break
        mainmenu()
main()

def deleteInvoiceID(): #Deleting an invoice function
        while True:
                deleteInvoiceID = input("\nPlease enter the invoiceID of the invoice you wish to delete: ")
                if deleteInvoiceID == "-1":
                        Menu()
                elif invoiceID.isalpha() == False:
                        print("\nInvoiceID must only contain alpha.\n") #Checks if invoice is only alpha
                else:
                        break
                        f = open("invoiceID.txt","r")
                        lines = f.readlines()
                        f.close()
                        f = open("invoiceID.txt","w")
                        for line in lines:
                                if line[0:10].lower().strip() != invoiceID.lower().strip():
                                        f.write(line)
                                        f.close()
                                        print("InvoiceID successfully deleted") #Invoice is now removed from the files


def removeProduct():
        product = input("What product would you like to delete (Insert Name)? ") #Checks the product name is its correct
        f = open("stock.txt","r+")
        r = open("newStocks.txt","w")
        deleted = 0
        for line in f:
                stock = line [0:25]
                stock = stock.lower()
                stock = stock.strip()
                if product == stock:
                        deleted = deleted + 1
                        line = ""
                r.write(line+'\n')
                f.close()
                r.close()
                if deleted == 1:
                        print("\nProduct name '"+str(product)+"' has been deleted!") #Product is now removed from the file
                cleanupProduct()



def cleanupProduct():
        with open("newStocks.txt","r+") as f, open("stock.txt","w") as r:
                for i in f.readlines():
                        if not i.strip():
                                continue
                        if i:
                                r.write(i)

        f.close()
        r.close()
        mainMenu()


def PaidOrders(): #This prints the paid menu - used to check if paid

    while True: #Checks the ID given by user if valid or not
        orderID = input("Please enter the order ID you want to pay for: ")
        with open('orders.txt') as f:
            if orderID in f.read():
                print("OrderID verified")

        with open('paid.txt') as h: #Checks to see if this has been paid or not
            if orderID in h.read():
                print("OrderID already paid for") #Prints to sreen and shows order
                mainMenu()
            else:
                print(orderID+" does not exist/has not been paid") #The ID given is payed or not existent in the current file
                mainMenu()
main()